2002-06-11 Daniel Jacobowitz <drow@mvista.com>

* gdbserver/thread-db.c: New file.
	* gdbserver/proc-service.c: New file.
	* gdbserver/acinclude.m4: New file.
	* gdbserver/Makefile.in: Add GDBSERVER_LIBS, gdb_proc_service_h,
	proc-service.o, and thread-db.o.
	(linux-low.o): Add USE_THREAD_DB.
	* gdbserver/acconfig.h: Add HAVE_PRGREGSET_T, HAVE_PRFPREGSET_T,
	HAVE_LWPID_T, HAVE_PSADDR_T, and PRFPREGSET_T_BROKEN.
	* gdbserver/aclocal.m4: Regenerated.
	* gdbserver/config.in: Regenerated.
	* gdbserver/configure: Regenerated.
	* gdbserver/configure.in: Check for proc_service.h, sys/procfs.h,
	thread_db.h, and linux/elf.h headrs.
	Check for lwpid_t, psaddr_t, prgregset_t, prfpregset_t, and
	PRFPREGSET_T_BROKEN.  Introduce srv_thread_depfiles and USE_THREAD_DB.
	Check for -lthread_db and thread support.
	* gdbserver/configure.srv: Enable thread_db support for ARM, i386, MIPS,
	PowerPC, and SuperH.
	* gdbserver/i387-fp.c: Constify arguments.
	* gdbserver/i387-fp.h: Likewise.
	* gdbserver/inferiors.c: (struct thread_info): Renamed from
	`struct inferior_info'.  Remove PID member.  Use generic inferior
	list header.  All uses updated.
	(inferiors, signal_pid): Removed.
	(all_threads): New variable.
	(get_thread): Define.
	(add_inferior_to_list): New function.
	(for_each_inferior): New function.
	(change_inferior_id): New function.
	(add_inferior): Removed.
	(remove_inferior): New function.
	(add_thread): New function.
	(free_one_thread): New function.
	(remove_thread): New function.
	(clear_inferiors): Use for_each_inferior and free_one_thread.
	(find_inferior): New function.
	(find_inferior_id): New function.
	(inferior_target_data): Update argument type.
	(set_inferior_target_data): Likewise.
	(inferior_regcache_data): Likewise.
	(set_inferior_regcache_data): Likewise.
	* gdbserver/linux-low.c (linux_bp_reinsert): Remove.
	(all_processes, stopping_threads, using_thrads)
	(struct pending_signals, debug_threads, pid_of): New.
	(inferior_pid): Replace with macro.
	(struct inferior_linux_data): Remove.
	(get_stop_pc, add_process): New functions.
	(linux_create_inferior): Restore SIGRTMIN+1 before calling exec.
	Use add_process and add_thread.
	(linux_attach_lwp): New function, based on old linux_attach.  Use
	add_process and add_thread.  Set stop_expected for new threads.
	(linux_attach): New function.
	(linux_kill_one_process): New function.
	(linux_kill): Kill all LWPs.
	(linux_thread_alive): Use find_inferior_id.
	(check_removed_breakpoints, status_pending_p): New functions.
	(linux_wait_for_process): Renamed from linux_wait_for_one_inferior.
	Update.  Use WNOHANG.  Wait for cloned processes also.  Update process
	struct for the found process.
	(linux_wait_for_event): New function.
	(linux_wait): Use it.  Support LWPs.
	(send_sigstop, wait_for_sigstop, stop_all_processes)
	(linux_resume_one_process, linux_continue_one_process): New functions.
	(linux_resume): Support LWPs.
	(REGISTER_RAW_SIZE): Remove.
	(fetch_register): Use register_size instead.  Call supply_register.
	(usr_store_inferior_registers): Likewise.  Call collect_register.
	Fix recursive case.
	(regsets_fetch_inferior_registers): Improve error message.
	(regsets_store_inferior_registers): Add debugging.
	(linux_look_up_symbols): Call thread_db_init if USE_THREAD_DB.
	(unstopped_p, linux_signal_pid): New functions.
	(linux_target_ops): Add linux_signal_pid.
	(linux_init_signals): New function.
	(initialize_low): Call it.  Initialize using_threads.
	* gdbserver/regcache.c (inferior_regcache_data): Add valid
	flag.
	(get_regcache): Fetch registers lazily.  Add fetch argument
	and update all callers.
	(regcache_invalidate_one, regcache_invalidate): New
	functions.
	(new_register_cache): Renamed from create_register_cache.
	Return the new regcache.
	(free_register_cache): Change argument to a void *.
	(registers_to_string, registers_from_string): Call get_regcache
	with fetch flag set.
	(register_data): Make static.  Pass fetch flag to get_regcache.
	(supply_register): Call get_regcache with fetch flag clear.
	(collect_register): Call get_regcache with fetch flag set.
	(collect_register_as_string): New function.
	* gdbserver/regcache.h: Update.
	* gdbserver/remote-utils.c (putpkt): Flush after debug output and use
	stderr.
	Handle input interrupts while waiting for an ACK.
	(input_interrupt): Use signal_pid method.
	(getpkt): Flush after debug output and use stderr.
	(outreg): Use collect_register_as_string.
	(new_thread_notify, dead_thread_notify): New functions.
	(prepare_resume_reply): Check using_threads.  Set thread_from_wait
	and general_thread.
	(look_up_one_symbol): Flush after debug output.
	* gdbserver/server.c (step_thread, server_waiting): New variables.
	(start_inferior): Don't use signal_pid.  Update call to mywait.
	(attach_inferior): Update call to mywait.
	(handle_query): Handle qfThreadInfo and qsThreadInfo.
	(main): Don't fetch/store registers explicitly.  Use
	set_desired_inferior.  Support proposed ``Hs'' packet.  Update
	calls to mywait.
	* gdbserver/server.h: Update.
	(struct inferior_list, struct_inferior_list_entry): New.
	* gdbserver/target.c (set_desired_inferior): New.
	(write_inferior_memory): Constify.
	(mywait): New function.
	* gdbserver/target.h: Update.
	(struct target_ops): New signal_pid method.
	(mywait): Removed macro, added prototype.

	* gdbserver/linux-low.h (regset_func): Removed.
	(regset_fill_func, regset_store_func): New.
	(enum regset_type): New.
	(struct regset_info): Add type field.  Use new operation types.
	(struct linux_target_ops): stop_pc renamed to get_pc.
	Add decr_pc_after_break and breakpoint_at.
	(get_process, get_thread_proess, get_process_thread)
	(strut process_info, all_processes, linux_attach_lwp)
	(thread_db_init): New.

	* gdbserver/linux-arm-low.c (arm_get_pc, arm_set_pc,
	arm_breakpoint, arm_breakpoint_len, arm_breakpoint_at): New.
	(the_low_target): Add new members.
	* gdbserver/linux-i386-low.c (i386_store_gregset, i386_store_fpregset)
	(i386_store_fpxregset): Constify.
	(target_regsets): Add new kind identifier.
	(i386_get_pc): Renamed from i386_stop_pc.  Simplify.
	(i386_set_pc): Add debugging.
	(i386_breakpoint_at): New function.
	(the_low_target): Add new members.
	* gdbserver/linux-mips-low.c (mips_get_pc, mips_set_pc)
	(mips_breakpoint, mips_breakpoint_len, mips_reinsert_addr)
	(mips_breakpoint_at): New.
	(the_low_target): Add new members.
	* gdbserver/linux-ppc-low.c (ppc_get_pc, ppc_set_pc)
	(ppc_breakpoint, ppc_breakpoint_len, ppc_breakpoint_at): New.
	(the_low_target): Add new members.
	* gdbserver/linux-sh-low.c (sh_get_pc, sh_set_pc)
	(sh_breakpoint, sh_breakpoint_len, sh_breakpoint_at): New.
	(the_low_target): Add new members.
	* gdbserver/linux-x86-64-low.c (target_regsets): Add new kind
	identifier.

gdb/gdbserver/regcache.c

@@ -27,6 +27,7 @@
 
 struct inferior_regcache_data
 {
+  int registers_valid;
   char *registers;
 };
 
@@ -38,7 +39,7 @@ static int num_registers;
 const char **gdbserver_expedite_regs;
 
 static struct inferior_regcache_data *
-get_regcache (struct inferior_info *inf)
+get_regcache (struct thread_info *inf, int fetch)
 {
   struct inferior_regcache_data *regcache;
 
@@ -47,17 +48,50 @@ get_regcache (struct inferior_info *inf)
   if (regcache == NULL)
     fatal ("no register cache");
 
+  /* FIXME - fetch registers for INF */
+  if (fetch && regcache->registers_valid == 0)
+    {
+      fetch_inferior_registers (0);
+      regcache->registers_valid = 1;
+    }
+
   return regcache;
 }
 
+void
+regcache_invalidate_one (struct inferior_list_entry *entry)
+{
+  struct thread_info *thread = (struct thread_info *) entry;
+  struct inferior_regcache_data *regcache;
+
+  regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread);
+
+  if (regcache->registers_valid)
+    {
+      struct thread_info *saved_inferior = current_inferior;
+
+      current_inferior = thread;
+      store_inferior_registers (-1);
+      current_inferior = saved_inferior;
+    }
+
+  regcache->registers_valid = 0;
+}
+
+void
+regcache_invalidate ()
+{
+  for_each_inferior (&all_threads, regcache_invalidate_one);
+}
+
 int
 registers_length (void)
 {
   return 2 * register_bytes;
 }
 
-void
-create_register_cache (struct inferior_info *inferior)
+void *
+new_register_cache (void)
 {
   struct inferior_regcache_data *regcache;
 
@@ -67,15 +101,19 @@ create_register_cache (struct inferior_info *inferior)
   if (regcache->registers == NULL)
     fatal ("Could not allocate register cache.");
 
-  set_inferior_regcache_data (inferior, regcache);
+  regcache->registers_valid = 0;
+
+  return regcache;
 }
 
 void
-free_register_cache (struct inferior_info *inferior)
+free_register_cache (void *regcache_p)
 {
-  free (get_regcache (current_inferior)->registers);
-  free (get_regcache (current_inferior));
-  set_inferior_regcache_data (inferior, NULL);
+  struct inferior_regcache_data *regcache
+    = (struct inferior_regcache_data *) regcache_p;
+
+  free (regcache->registers);
+  free (regcache);
 }
 
 void
@@ -99,7 +137,7 @@ set_register_cache (struct reg *regs, int n)
 void
 registers_to_string (char *buf)
 {
-  char *registers = get_regcache (current_inferior)->registers;
+  char *registers = get_regcache (current_inferior, 1)->registers;
 
   convert_int_to_ascii (registers, buf, register_bytes);
 }
@@ -108,7 +146,7 @@ void
 registers_from_string (char *buf)
 {
   int len = strlen (buf);
-  char *registers = get_regcache (current_inferior)->registers;
+  char *registers = get_regcache (current_inferior, 1)->registers;
 
   if (len != register_bytes * 2)
     {
@@ -155,10 +193,10 @@ register_size (int n)
   return reg_defs[n].size / 8;
 }
 
-char *
-register_data (int n)
+static char *
+register_data (int n, int fetch)
 {
-  char *registers = get_regcache (current_inferior)->registers;
+  char *registers = get_regcache (current_inferior, fetch)->registers;
 
   return registers + (reg_defs[n].offset / 8);
 }
@@ -166,7 +204,7 @@ register_data (int n)
 void
 supply_register (int n, const void *buf)
 {
-  memcpy (register_data (n), buf, register_size (n));
+  memcpy (register_data (n, 0), buf, register_size (n));
 }
 
 void
@@ -178,7 +216,13 @@ supply_register_by_name (const char *name, const void *buf)
 void
 collect_register (int n, void *buf)
 {
-  memcpy (buf, register_data (n), register_size (n));
+  memcpy (buf, register_data (n, 1), register_size (n));
+}
+
+void
+collect_register_as_string (int n, char *buf)
+{
+  convert_int_to_ascii (register_data (n, 1), buf, register_size (n));
 }
 
 void